/*
 * $Id: ListRolloverController.java 3707 2010-07-08 19:19:25Z kschaefe $
 *
 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.rollover;

import java.awt.Cursor;
import java.awt.Point;
import java.awt.Rectangle;

import javax.swing.JList;
import javax.swing.ListCellRenderer;

/**
 * listens to rollover properties. Repaints effected component regions. Updates
 * link cursor.
 * 
 * @author Jeanette Winzenburg
 */
public class ListRolloverController<T extends JList> extends RolloverController<T> {

	private Cursor oldCursor;

	// --------------------------------- JList rollover

	@Override
	protected void rollover(Point oldLocation, Point newLocation) {
		// PENDING JW - track down the -1 in location.y
		if (oldLocation != null) {
			Rectangle r = component.getCellBounds(oldLocation.y, oldLocation.y);
			// LOG.info("old index/cellbounds: " + index + "/" + r);
			if (r != null) {
				component.repaint(r);
			}
		}
		if (newLocation != null) {
			Rectangle r = component.getCellBounds(newLocation.y, newLocation.y);
			// LOG.info("new index/cellbounds: " + index + "/" + r);
			if (r != null) {
				component.repaint(r);
			}
		}
		setRolloverCursor(newLocation);
	}

	/**
	 * something weird: cursor in JList behaves different from JTable? Hmm ..
	 * no: using the table code snippets seems to fix #503-swingx
	 * 
	 * @param location
	 */
	private void setRolloverCursor(Point location) {
		if (hasRollover(location)) {
			if (oldCursor == null) {
				oldCursor = component.getCursor();
				component.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
			}
		} else {
			if (oldCursor != null) {
				component.setCursor(oldCursor);
				oldCursor = null;
			}
		}
		// if (hasRollover(location)) {
		// oldCursor = component.getCursor();
		// component.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
		// } else {
		// component.setCursor(oldCursor);
		// oldCursor = null;
		// }

	}

	@Override
	protected RolloverRenderer getRolloverRenderer(Point location, boolean prepare) {
		ListCellRenderer renderer = component.getCellRenderer();
		RolloverRenderer rollover = renderer instanceof RolloverRenderer ? (RolloverRenderer) renderer : null;
		if ((rollover != null) && !rollover.isEnabled()) {
			rollover = null;
		}
		if ((rollover != null) && prepare) {
			Object element = component.getModel().getElementAt(location.y);
			renderer.getListCellRendererComponent(component, element, location.y, false, true);
		}
		return rollover;
	}

	@Override
	protected Point getFocusedCell() {
		int leadRow = component.getLeadSelectionIndex();
		if (leadRow < 0)
			return null;
		return new Point(0, leadRow);
	}

}